Re: [fetch] Introduce Response.body. (#118) (#128)

>     <span title=concept-Headers-guard>guard</span> is "<code title>immutable</code>".
> +
> +   <li><p>If <var title>response</var>'s status is a <span>null body status</span>, resolve
> +   <var title>p</var> with <var title>res</var> and abort these steps.

This is related to the below comment. If &lt;concept-response-body&gt; is a ReadableStream, we don't need this item. Otherwise, we need this early-exit to make `res` have null body.

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